题目内容
（请给出正确答案）
Which of the following best defines the word "aggressive"？
A．Bold.
B．Harmful.
C．Careless.
D．Desperate.
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更多“Which of the following best defines the word "aggressive"？A．Bold.B．Harmful.C．Careless.D．De”相关的问题
A．set right
B．set out
C．set free
D．set over
A．attract
B．delight
C．console
D．inspire
A．heated
B．scaled
C．sterilized
D．burned
A．heated
B．scaled
C．sterilized
D．burned
A．scale
B．surpass
C．overcome
D．mount
A．scale
B．surpass
C．overcome
D．mount
A．contracted
B．contested
C．contented
D．contrasted
A．has remembered
B．love
C．published
D．first work
The tool is the laser and it is, being used by more and more surgeons all over the world, for a very large number of different complaints. The word laser means: Light Amplification by Stimulated Emission of Radiation. As we all know, light is hot; any source of light--from the sun itself down to a humble match burning--will give warmth. But light is usually spread out over a wide area. The light in a laser beam, however, is concentrated. This means that a light with no more power than that produced by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam.
Experiments with these pinpoint beams have shown researchers that different energy sources produce beams that have a particular effect on certain living cells. It is possible for eye surgeons to operate on the back of the human eye without harming the front of the eye, simply by passing a laser beam right through the eyeball. No knives, no stitches, no unwanted damage--a true surgical wonder.
Operations which once left patients exhausted and in need of long periods of recovery time now leave them feeling relaxed and comfortable. So much more difficult operations can now be tried.
The rapid development of laser techniques in the past ten years has made it clear that the future is likely to be very exciting. Perhaps some cancers will be treated with laser in a way that makes surgery not only safer but more effective. Altogether, tomorrow may see more and more information coming to light on the diseases which can be treated medically.
We find that after the development of the laser in the 1960s, ______.
A．medical help became available to industrial workers
B．the study of surgical techniques went through a complete revolution
C．more and more surgeons began using surgical instruments
D．man's whole approach to surgery changed completely
A．in another ten years we shall be able to cure cancer
B．surgery is likely to improve considerably
C．we shall be able to treat all the diseases we suffer from
D．we are now able to treat most forms of cancer
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